I am sorry to report that it has been cancelled. My wife and I were distraught to learn of the end of Boomtown. Apparently the network demanded a serious overhaul of the format and tone of the series. They wanted a lighter and more standard police procedural. By all accounts the resulting product was abysmal.
Who could have guessed ten years ago that I would be saying this but, I will watch anything with Donnie Wahlberg in it. If you need a fix check out the fantastic movie Diamond Men* with him and Robert Forster.
Sorry to deliver the bad news.